Door Lock Cancel
Door Lock Cancel (abbreviated as DLC) is a trick in Metroid Prime 2: Echoes in which the lock of a door can be temporarily overridden by shooting the door on the same frame that the game locks it. If a projectile activates a door on the same frame that it is locked, loading the room that it is connected to and entering the trigger that opens the door will cause the door to ignore the fact that it should be locked. The result is that the door will open as normal, despite the visual of the lock still being in place, and Samus will be able to move through the door and transition before she is normally supposed to. This can work in any room which has a lock that Samus can shoot on the same frame, including Temple Access (Sanctuary Fortress) (whose strat uses a precisely timed power beam shot), Portal Terminal (which uses a Power Bomb, and even Sanctum (which uses a missile). Since this trick can be done with a variety of different weapons, this allows for different setups to be possible for different rooms. In the case of the Sanctum DLC, since the door locks during the cutscene, a missile is shot at a precise time so that it hits the door after Samus activates the cutscene trigger.
In theory, this could work for the door that locks in Hive Chamber B to potentially solve Item Loss Skip for 100%. The problem is that the door locks too far into the cutscene for any weapon to activate it in time. With current knowledge, this means that ILS in 100% is still impossible.